Green Issue: Green screen special effects make the impossible possible
Isabel Gonzalez | April 19From daily newscasts to sci-fi films, green screens can be seen — or perhaps more accurately, not seen — in many forms of media. A green screen is a special effects tool that helps combine multiple visuals into a single image. The technical term for this process is compositing, and it all starts with an equation: A + B (1-a). “A” represents the foreground plate, which is the image that one wants to keep. “B” represents the background plate, which is simply the background to be added. To keep the desired parts from “B,” it must be multiplied by the inverse alpha, represented by “A.” “It isn’t the math part that’s hard, it’s the problem solving that’s hard,” said Paris Premdas, a senior interdisciplinary film and digital media major.













